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9b4bf7de6c
PR-URL: https://github.com/nodejs/node/pull/23423 Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Gus Caplan <me@gus.host> Reviewed-By: Myles Borins <myles.borins@gmail.com>
35 lines
1.1 KiB
JavaScript
35 lines
1.1 KiB
JavaScript
// Copyright 2018 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --allow-natives-syntax
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// This tests that SpeculativeNumberSubtract can still lower to
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// Int32Sub in SimplifiedLowering, which requires some magic
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// to make sure that SpeculativeNumberSubtract survives to that
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// point, especially the JSTypedLowering needs to be unable
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// to tell that the inputs to SpeculativeNumberAdd are not
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// Number, Undefined, Null or Boolean.
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(function() {
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// We need a function that has a - with feedback Number or
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// NumberOrOddball, but for whose inputs the JSTypedLowering
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// cannot reduce it to NumberSubtract (with SpeculativeToNumber
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// conversions). We achieve this utilizing an object literal
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// indirection here.
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function baz(x) {
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return {x}.x - x;
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}
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baz(null);
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baz(undefined);
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// Now we just need to truncate the result.
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function foo(x) {
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return baz(42) | 0;
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}
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assertEquals(0, foo());
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assertEquals(0, foo());
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%OptimizeFunctionOnNextCall(foo);
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assertEquals(0, foo());
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})();
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